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> For no apparent reason, a connection to a website can freeze and it 
> takes up to a minute before I can browse that or any other site. Pinging 
> the websites works just fine, but connecting to it via a webbrowser does 
> not work
> 

Gustav,

Have you tried to allow fragmented packets (default pass rule on LAN 
interface)? Have you tried to lower the MTU of the WAN interface?

-- Vincent